题解 | #句子逆序#

#include <stdio.h>
#include <string.h>

void reverse(char* start, char* end) {
    char m;
    while (start < end) {
        m = *end;
        *end = *start;
        *start = m;
        end--;
        start++;
    }
}

void WoldReverse(char* s, int s_len) {
    int sat = 0;
    for (int i = 0; i <= s_len; i++) {
        while ((s[i] == ' ') || (s[i] == '\0')) {
            reverse(s + sat, s + i - 1);
            sat = i + 1;
            break;
        }
    }
}



int main() {

    char arr[1000];
    fgets(arr, sizeof(arr), stdin);
    int len = strlen(arr) - 1;
    arr[len] = '\0';
    WoldReverse(arr, len);
    reverse(arr, arr + len - 1);
    printf("%s", arr);
    return 0;


}